So my wife pulls up in my 89 YJ (2.5L) and it looks as though she is dragging something on the ground under the engine compartment. Upon closer inspection it appears to be some type of vacuum tube that is thick (around 1/2"). It is coming from a small canister that protrudes from the top of the valve cover, and is now dragging on the ground below the front axle. I tried looking at Vacuum diagrams, but they are very rudimentary and make the assumption that you know what you are looking at in the first place!